組織に居住する先天性リンパ球細胞および先天性T細胞によるがん免疫監視
Saïda Dadi1, Sagar Chhangawala2, Benjamin M Whitlock3
1Immunology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.
Cell
|January 26, 2016
まとめ
免疫系は免疫監視によって悪性腫瘍を抑制し,初期の腫瘍では独特のリンパ球が拡大します. このプロセスはIL-15に依存し,新しいがん免疫監視メカニズムを強調しています.
科学分野:
- 免疫学
- 癌 生物学
- 細胞免疫学
背景:
- 免疫系は免疫監視を通して癌を抑制する役割を果たします.
- 自発的な癌に対する免疫監視に関与する正確なメカニズムと細胞タイプは完全に理解されていません.
研究 の 目的:
- 腫瘍遺伝子誘発のネズミのがんモデルにおける免疫監視の範囲と細胞組成を調べる
- 腫瘍の早期抑制に関与する特定のリンパ球群を特定する.
主な方法:
- 腫瘍遺伝子を誘発したマウスのがんモデルを使用した.
- 初期腫瘍内のリンパ球集団をフローサイトメトリと遺伝子発現プロファイリングを使用して分析した.
- リンパ球の生成と腫瘍の成長におけるインタールイキン-15 (IL-15) と核因子,エリトroid 2 Like 2 (Nfil3) の役割を調査した.
主要な成果:
- 組織に定着する細胞毒性リンパ球 (先天性,T細胞受容体 (TCR) αβ,およびTCRγδ系統) の明確な集団が,早期の腫瘍で拡大している.
- これらのリンパ球はNK1. 1,CD49a,CD103を発現し,通常の免疫細胞とは異なる遺伝子発現シグネチャーを持っています.
- リンパ球の生成はIL-15に依存し,IL-15の欠乏は腫瘍の成長を加速しますが,Nfil3の欠乏はそうではありません.
結論:
- 腫瘍に誘発された新しい免疫監視メカニズムが発見され,従来とは異なるタイプ1の先天性リンパ性細胞と,タイプ1の先天性T細胞を含む.
- 腫瘍抑制リンパ球の生成における IL-15 の重要な役割が示されました.
- このIL-15依存経路と従来のNK細胞分化のためのNfil3依存経路の違いを強調した.
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